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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1381 - Misfire Detected No EBCM/Pcm Serial Data >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition on. Using scan tool, select CHASSIS APPLICATION and attempt to display ABS DATA. If ABS DATA is displayed, go to next step. If ABS DATA is not displayed, go to step 4).
  3. Check serial data circuit for open or faulty connection between EBCM and PCM. Repair as necessary. If circuit or connection is okay, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect EBCM harness connector. Turn ignition on. Using a DVOM, check voltage on EBCM harness connector serial data circuit. If voltage is 1-5 volts, go to next step. If measured voltage is not 1-5 volts, go to step 6).
  5. Check for faulty connection at EBCM. Repair as necessary. After repairs, go to step 7). If connection is okay, go to next step.
  6. Check for open serial data circuit to EBCM. Repair as necessary. After repairs, go to next step. If circuit is okay, perform ABS system diagnosis. See ANTI-LOCK BRAKE SYSTEM article in BRAKES section.
  7. Turn ignition on. Using scan tool, select CHASSIS APPLICATION and attempt to display ABS DATA. If ABS DATA is displayed, repair is complete. If ABS DATA is not displayed, return to step 4).
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